Funny....most of the heavy equipment I have dealt with use two-12V batteries in series for 24V. The alternators are always 24V.
I can't imagine that highway tractors are much different. The higher voltage just works so much better for everything.
The only 24v system I saw that was different from this was on a Russian farm tractor I have (a Belarus). It uses 24V on the starter but charges at 12V and everything else was 12V. It has some weird wiring to accomplish this.
Jon.
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